The MPC shows that applying to all the F-Series and Broncos from 1980 through 1989, which is as far as it goes. HOWEVER, A7T was Caramel and it was only used in 1980. So if that really is an A7T it came from a 1980 truck.
Here's the entry for 1986, and I've highlighted the uses of E3TZ 1013010:
Gary, AKA "Gary fellow":
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Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI